There is no limit for rowCount and colCount, so you can choose the size of the arena by yourself. The following symbols are used for the arena map.

'=' a wall item
' ' a hole item
'_' a ground item
'+' a block item
'x' will randomly create a block or a ground item
'-' an ice item
'o' a mortar item
'u' an arrow up
'r' an arrow right
'd' an arrow down
'l' an arrow left
'p' a player position